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Does gravity do positive or negative work on falling objectexplain?
Wiki User
∙ 11y ago
It does positive work. There's 2 ways to look at this:
1) This one's a chemistry way. When work is done on a system by the surroundings, the work is positive. When the system itself is doing work on the surroundings, this is negative work. Just think of it in terms of the system. It gains energy when something does work to it and loses energy when it works on something else. Based on this, do you think it's positive or negative work?
2) This one's a physics way. W = Fd cos (theta). In this equation, W = work, F = a force, d = displacement, and theta = angle between the force and the displacement. So, let's take the example of a falling object. As it falls, the force of gravity is exerting a force towards the ground. The object is moving towards the ground also. Since both the directions are the same, theta is 0 and work is + (cos of angle 0 is +1). When the object is moving upward while gravity is acting on it, exerting a downward force, the angle between them is 180 degrees. At 180 degrees, cos is -1. Work done by gravity is negative in this case.
Either ways, positive work is being done by gravity on the falling object.
Wiki User
∙ 11y ago
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Is gravitational force positive or negative?
Gravity force is always downward and it depends how you define the coordinate system. By convention down is negative, but that is only a general rule
What are positive negative and neutral buoyancies?
Positive buoyancy . . .When the object is completely submerged, the net force on it ... the combinationof gravity down and buoyancy up ... is upward, so the object tries to rise.Negative buoyancy . . .When the object is completely submerged, the net force on it ... the combinationof gravity down and buoyancy up ... is downward, so the object tries to sink.Neutral buoyancy . . .When the object is completely submerged, the net force on it ... the combinationof gravity down and buoyancy up ... is zero. The object stays at whatever depthit is released, without rising or sinking.
Which object weighs approximately 1 newton?
The weight of an average apple is around one Newton. Rather appropriate when you consider that it was a falling apple that made Newton think about gravity.
Does a book falling from a shelf have gravitational energy?
Yes; while on the shelf it has potential energy due to gravity of mgh where m = mass and g =gravity acceleration and h is height fom floor. As it falls its potential energy is converted to kinetic energy mv squared/2 where v = velocity
How do you make an object 'jump' in a Game Maker game?
The easiest way to jump is by entering this code in the correct places. You could set the gravity but this way is easier. This will work in both the pro and lite put this code in you Create event of you player falling=false; //Variable for Falling hitting=false; //Variable for if you are hitting something grav=7; //Gravity movement=6; //Speed at which you move jump=0; //Used for jumping jumping=false; //If you are jumping or not space=false; //if space is pressed doublejumping=false //if doublejumping doublej=0; //for doublejumping put this code in you step event of you player //FALLING: if(!collision_point(x,y,ground,true,false) && !jumping && !doublejumping) //not touching ground, or jumping{ y+=grav; //Move down the number gravity grav=7; //Keeps gravity set falling=true; //says the player is falling } if(keyboard_check_pressed(vk_space)){ //if keypressed SPACE space=true //space=true. For other purposes } if(keyboard_check_released(vk_space)){ //if space not pressed space=false //space is false } if(space=true && jumping==false) //if space is pressed, and jumping is false{ jumping=true; //jumps space=false //space no longer pressed } if(space=true && jumping==true && doublejumping=false) //if space pressed, player jumping, and not doublejumping { doublejumping=true //doublejumps jumping=false //no more jumping } if(jumping) //if jumping is true{ y-=jump; //go up jump jump-=.5; //lower jump a little if(jump<0) && doublejumping=false //if jump is nil and not doublejumping { falling=true; //fall } if(jump<-10) { //if jump is below -10, set it to 10 jump=-10; } } if(doublejumping) //if doublejumping{ y-=doublej; //go up doublej doublej-=.5; //lower doublej a little if(doublej<0) { //is doublej is nil, fall falling=true; } if(doublej<-10) { //if doublej is below -10, set it to -10 doublej=-10; } } if(collision_point(x,y,ground,true,false) && falling) { //if touching ground and falling jump=10; //jump is 10, for next jump jumping=false; //No longer jumping falling=false; //no longer falling doublejumping=false //no longer doublejumping } if(keyboard_check(vk_left)) { //MOVEMENT. if left key is pressed x-=movement; //move left } if(keyboard_check(vk_right)) { //if right pressed x+=movement; //move right } if falling=false && jumping=true { //if falling is false, and jumping is true { doublej=10; //doublej is 10 } } Done. if you r having trouble download the example http://www.willhostforfood.com/users/warsome/doublejumpgrav.gmk
Is the gravity value positive or negative when an object falls on the ground?
The force of gravity is positive; there is no negative gravity.
Would zero gravity be at the same height and positive gravity be pulling and negative gravity be pushing?
No
How do you make a positive versus a negative ion?
gravity
Can their be negative gravity?
Yes, there can be negative gravity. If a gravity is a pulling force then in the other hands a negative gravity would be a pushing force, in other words, the negative gravity would push us to wherever and the positive gravity on Earth would pull us.
When can you used the positive acceleration due to gravity and negative acceleration due to gravity?
If you define the "up" direction as "positive", then the acceleration is negative, because it is downward. If you define "down" as positive, then acceleration is negative. You can use any convention; just be sure to be consistent within a particular calculation, to avoid errors.
What is the difference between positive and negative gravitopism?
Gravitopism is a plants reaction to gravity
What is a positive and negative tropisms?
A positive tropism is something that bends with gravity or bends towards the light or the roots grow towards water. A negative tropism does the exact opposite.
Why is gravitational potential always negative?
because gravity is a force that acts down on an object. In physics up is positive and down is negative
How can you calculate the velocity and acceleration of falling objects?
Acceleration:Always the same, doesn't need to be calculated. Acceleration of gravity = 9.8 meters (32.2 ft) per second2Acceleration of gravity is negative (points down).Velocity:(Initial velocity) + [ (acceleration) x (time) ]Positive velocity = moving upNegative velocity = moving down
When was Falling - Gravity Kills song - created?
Falling - Gravity Kills song - was created in 1997.
Is gravitational force positive or negative?
Gravity force is always downward and it depends how you define the coordinate system. By convention down is negative, but that is only a general rule
Is it possible for the instataneous velocity to have been negative at any time in the interval suppose the particle started at the origin x 0?
Yes. Since velocity is a vector it can have negative values when the object is moving in the direction opposite to the direction defined as the positive direction. For example, if an object is thrown vertically upwards and the upward direction is considered the positive direction, then when the object is falling downwards under gravity, its velocity is negative (in the upward direction). Coversely, if the downward direction is defined as the positive direction, then the object has a negative velocity during the first stage of the trajectory.
